EXAMPLES:

Habits
He drinks tea at breakfast.
She only eats fish.
They watch television regularly.

Repeated actions or events
We catch the bus every morning.
It rains every afternoon in the hot season.
They drive to Monaco every summer.

General facts
Water freezes at zero degrees.
The Earth revolves around the Sun.
Her mother is Peruvian.

Instructions or guidelines
Open the packet and pour the contents into hot water.
You take the No.6 bus to Watney and then the No.10 to Bedford.

Scheduled Events
His mother arrives tomorrow.
Our holiday starts on the 26th March

TRAINING THE "SIMPLE PRESENT": TO THINK (THINK)
Remember the structure? No??? So let's review!

Affirmative                      Interrogative                        Negative 
I think                                 Do I think?                             I do not/don't think
You think                           Do you think?                       You do not/don't think
He thinks                           Does he think?                     He does not/doesn't think
She thinks                         Does she think?                   She does not/doesn't think
It thinks                             Does it think?                        It does not/doesn't think
We think                            Do we think?                         We do not/don't think.
They think                         Do they think?                       They do not/don't think.

NOTES ABOUT THE THIRD PERSON OF THE SINGULAR (HE, SHE, IT) IN THE "SIMPLE PRESENT"

In the third person singular, the verb always ends in -s:
he wants, he gives, he thinks.
The negative and interrogative forms use DOES (= third person of the auxiliary "DO") + infinitive of the verb.
He wants ice cream. Does he want strawberry? He does not want vanilla.
Verbs ending in -y: in the third person singular, change -y by -ies:
fly -> flies, cry -> cries
Exception: When there is a vowel before -y:
play -> plays, pray -> prays
Add them to verbs ending in: -ss, -x, -sh, -ch:
he passes, he catches, he fixes, he pushes

EXAMPLES:

He goes to school every morning.
She understands English.
It mixes the sand and the water.
He tries very hard.
She enjoys playing the piano.

Is it clearer now? Hmmm ... maybe a video can help make it clearer yet! So let's go!

The simple past tense shows that you are talking about something that has already happened. Unlike the past continuous tense, which is used to talk about past events that happened over a period of time, the simple past tense emphasizes that the action is finished.

You can also use the simple past to talk about a past state of being, such as the way someone felt about something. This is often expressed with the simple past tense of the verb to be and an adjective, noun, or prepositional phrase.

The contest was the highlight of his week.

For regular verbs, add -ed to the root form of the verb (or just -d if the root form already ends in an e):

Play→Played 
Type→Typed 
Listen→Listened 
Push→Pushed 
Love→Loved

For irregular verbs, things get more complicated. The simple past tense of some irregular verbs looks exactly like the root form:

Put→Put 
Cut→Cut 
Set→Set 
Cost→Cost 
Hit→Hit

For other irregular verbs, including the verb to be, the simple past forms are more erratic:

See→Saw 
Build→Built 
Go→Went 
Do→Did 
Rise→Rose 
Am/Is/Are→Was/Were

The good news is that verbs in the simple past tense (except for the verb to be) don’t need to agree in number with their subjects.

Fortunately, there is a formula for making simple past verbs negative, and it’s the same for both regular and irregular verbs (except for the verb to be). The formula is did not + [root form of verb]. You can also use the contraction didn’t instead of did not.

For the verb to be, you don’t need the auxiliary did. When the subject of the sentence is singular, use was not or wasn’t. When the subject is plural, use were not or weren’t.

The formula for asking a question in the simple past tense is did + [subject] + [root form of verb].

When asking a question with the verb to be, you don’t need the auxiliary did. The formula is was/were + [subject].

What's the difference between the Present Simple / Present Continuous and how to use them.
We use the present simple tense when we want to talk about fixed habits or routines – things that don’t change.

Compare these two statements:

(present simple) ‘I play tennis’ tells us that playing tennis is something the speaker always does. It is part of a routine or habit. We can call this a permanent situation.
(present continuous/ progressive) ‘I am playing tennis’ tells us that the speaker is playing tennis right now. Soon the game will be over. We call this a temporary situation.

With the present simple we say:
I play tennis

You play tennis

We play tennis

They play tennis
He/she/ it plays tennis.  Lu, lembre-se também das outras regras -ES e -IES

With the present continuous we say:
I am playing tennis

You are playing tennis

We are playing tennis

He/she/it is playing tennis

Frequency Adverbs we use with the Present Simple
With the present simple we use these frequency adverbs:
(Notice that the adverb comes before the main verb in the sentence.)

Always: ‘I always read before I go to bed.’
Often: ‘Her sister often comes shopping with us.’
Frequently:‘Michael frequently visits his family.’
Sometimes:‘You sometimes go to the gym, don’t you?’
Occasionally:‘It occasionally rains in summer.’
Seldom:‘They seldom ask for help.’
Rarely: ‘He rarely goes out without his backpack.’
Hardly ever:‘I hardly ever eat pizza.’

Never: ‘Japanese people never wear shoes inside.’

Time Expressions we use with the Present Continuous
With the present continuous we use these time expressions:
(Notice that the time expression can come at the start or at the end of the sentence.)

Now: ‘What are you doing, now?’

Nowadays: ‘I think you are smoking too much, nowadays.’

The following verbs are usually only used in Simple Present (NOT in the progressive form) .

Time to practice
Click on the links to practice.
https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises
https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex02
https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex03
https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex04
https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex05
https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex06
https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test2
https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test3